Usage Tips:Universal Replacement Pad: The 4.7 inch hook and loop replacement pad features 4 screw holes and 8 dust holes, fits most sander backing pads, distance between center and the center of pad screw holes is about 1-1/4 inch, please confirm the size before purchaseSuitable for sander with 4 screws: If your sander is not the above brand or model, please check if it fits your sander based on this information, 4.7 inch in diameter, 8 dust holes and 4 screw holes, especially the distance between the screws. center-to-center holes (1-1/4 inches)Quality material: these disc sander pads are made from rubber with smooth surfaces, not easy to break, which can be applied for a long time and many times, work well on sanding flat surfacesEasy assembly: Built-in mounting thread allows you to install the sander replacement pad easily and quickly, saving your time and effort to replace itExtend the life of the sander: you will receive 2 pieces of 8-hole sander hook and loop pads in the package, enough quantity for your personal use and replacement, effectively extending the life of the sander